Acetonitrile refining method

A refining method, acetonitrile technology, applied in the direction of separation method, chemical instrument and method, hydrocarbon ammoxidation preparation, etc., can solve the problems of acetonitrile output and output limitation, avoid multiple evaporation and condensation, improve the energy utilization rate of the device, save The effect of equipment occupation and investment

Pending Publication Date: 2021-10-15
CHINA TIANCHEN ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, as a by-product of acrylonitrile, the production of acetonitrile is limited by the production of acrylonitrile

Method used

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  • Acetonitrile refining method

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0056] Ammonia and acetic acid are added into the ammoniation reactor 3 to carry out the acetic acid ammoxidation reaction, the molar ratio of ammonia to acetic acid is 1.01, the reaction temperature is 350°C, the gas phase product at the outlet enters the ammonia recovery tower 4, and the tower top pressure is 150kPa, the tower The temperature at the top is -25°C, and ammonia gas is extracted from the gas phase at the top of the tower and sent to the acrylonitrile unit 5.

[0057] The crude acetonitrile obtained through the ammoxidation of propylene is sent to the decyanation tower 6, the pressure at the top of the tower is 105kPa, and the temperature at the top of the tower is 25°C. The acetonitrile-water azeotrope is extracted from the gas phase in the middle of the tower, and enters the purification reactor 7, and the temperature is controlled at 25-55°C.

[0058] The outlet liquid of the purification reactor 7 is mixed with the bottom liquid of the ammonia recovery tower ...

Embodiment 2

[0062] Ammonia and acetic acid are added into the ammoniation reactor 3 to carry out the ammoxidation reaction of acetic acid. The molar ratio of ammonia to acetic acid is 1.99, and the reaction temperature is 350°C. The temperature at the top is 10°C, and ammonia gas is extracted from the gas phase at the top of the tower and sent to the acrylonitrile unit 5.

[0063] The crude acetonitrile obtained through the ammoxidation of propylene is sent to the decyanation tower 6, the pressure at the top of the tower is 110kPa, and the temperature at the top of the tower is 75°C. The acetonitrile-water azeotrope is extracted from the gas phase in the middle of the tower, and enters the purification reactor 7, and the temperature is controlled at 25-55°C.

[0064] The outlet liquid of the purification reactor 7 is mixed with the bottom liquid of the ammonia recovery tower 4 and then enters the azeotropic tower 8, and the pressure at the top of the tower is 500kPa. The acetone-containi...

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Abstract

The invention provides an acetonitrile refining method which comprises the following steps: recovering unreacted ammonia gas discharged by an ammoniation reactor through an ammonia recovery tower, introducing the ammonia gas recovered by the ammonia recovery tower into an acrylonitrile device, carrying out a propylene ammoxidation reaction to obtain an acetonitrile crude product, carrying out decyanation on the acetonitrile crude product through a decyanation tower, and concentrating and rectifying the decyanated acetonitrile crude product, to obtain an acetonitrile finished product. According to the acetonitrile refining method disclosed by the invention, the unreacted ammonia gas after the acetic acid ammoniation reaction is recovered by the ammonia recovery tower and is used as a raw material of an acrylonitrile device, and a cryogenic reflux deamination technology is adopted, so that a large amount of ammonium salt wastewater generated by absorbing the ammonia gas by using acid liquor is avoided.

Description

technical field [0001] The invention belongs to the technical field of chemical synthesis, and in particular relates to a method for refining acetonitrile. Background technique [0002] Acetonitrile is a colorless liquid with a pungent smell, and is an important fine chemical intermediate product and chemical solvent. Such as as a solvent for extracting butadiene, a solvent for synthetic fibers and a solvent for some special paints. Solvents used in the petroleum industry to remove tar, phenols, etc. from petroleum hydrocarbons. In the oil industry, it is used as a solvent for extracting fatty acids from animal and vegetable oils, and as a solvent for the recrystallization of steroid drugs in medicine. Acetonitrile is an intermediate for the synthesis of medicines and spices, and a raw material for the synthesis of s-triazine nitrogen fertilizer synergists. In addition, it can also be used to synthesize 2-picoline, triazine, ethylamines, dipropionitrile, imidazole, propyl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C253/20C07C253/34C07C255/03C07C231/02C07C233/05C07C253/26C07C255/08C07C45/78C07C45/82C07C49/08B01D3/00
CPCC07C253/20C07C253/34C07C231/02C07C253/26C07C45/786C07C45/82B01D3/009C07C233/05C07C255/03C07C255/08C07C49/08
Inventor 于博耿尧辰王志明史文涛庄大为杨琦武
Owner CHINA TIANCHEN ENG
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